[PATCH v4 2/2] soc: qcom: aoss: Add debugfs entry

Sibi Sankar
2021-06-09T11:19:13Z

From: Deepak Kumar Singh <deesin@codeaurora.org>

It can be useful to control the different power states of various
parts of hardware for device testing. Add a debugfs node for qmp so
messages can be sent to aoss for debugging and testing purposes.

Signed-off-by: Chris Lew <clew@codeaurora.org>
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
drivers/soc/qcom/qcom_aoss.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)

diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
index e8f48760bac8..998ee7605eb2 100644
--- a/drivers/soc/qcom/qcom_aoss.c
+++ b/drivers/soc/qcom/qcom_aoss.c
@@ -4,6 +4,7 @@
*/
#include <dt-bindings/power/qcom-aoss-qmp.h>
#include <linux/clk-provider.h>
+#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/mailbox_client.h>
@@ -89,6 +90,9 @@ struct qmp {
struct clk_hw qdss_clk;
struct genpd_onecell_data pd_data;
struct qmp_cooling_device *cooling_devs;
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+ struct dentry *debugfs_file;
+#endif /* CONFIG_DEBUG_FS */
};

struct qmp_pd {
@@ -575,6 +579,32 @@ void qmp_put(struct qmp *qmp)
}
EXPORT_SYMBOL(qmp_put);

+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static ssize_t aoss_dbg_write(struct file *file, const char __user *userstr,
+ size_t len, loff_t *pos)
+{
+ struct qmp *qmp = file->private_data;
+ char buf[QMP_MSG_LEN] = {};
+ int ret;
+
+ if (!len || len >= QMP_MSG_LEN)
+ return len;
+
+ ret = copy_from_user(buf, userstr, len);
+ if (ret)
+ return len;
+
+ ret = qmp_send(qmp, buf, QMP_MSG_LEN);
+
+ return ret ? ret : len;
+}
+
+static const struct file_operations aoss_dbg_fops = {
+ .open = simple_open,
+ .write = aoss_dbg_write,
+};
+#endif /* CONFIG_DEBUG_FS */
+
static int qmp_probe(struct platform_device *pdev)
{
struct resource *res;
@@ -632,6 +662,11 @@ static int qmp_probe(struct platform_device *pdev)

atomic_set(&qmp->orphan, 0);

+#if IS_ENABLED(CONFIG_DEBUG_FS)
+ qmp->debugfs_file = debugfs_create_file("aoss_send_message", 0220, NULL,
+ qmp, &aoss_dbg_fops);
+#endif /* CONFIG_DEBUG_FS */
+
return 0;

err_remove_qdss_clk:
@@ -649,6 +684,10 @@ static int qmp_remove(struct platform_device *pdev)
{
struct qmp *qmp = platform_get_drvdata(pdev);

+#if IS_ENABLED(CONFIG_DEBUG_FS)
+ debugfs_remove(qmp->debugfs_file);
+#endif /* CONFIG_DEBUG_FS */
+
qmp_qdss_clk_remove(qmp);
qmp_pd_remove(qmp);